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For manual shrink film, also can be used for machine shrink film, can be widely used in all kinds of the concentration of goods packaging.
用于手工收缩膜，也可用于机用收缩膜，可广泛应用于各种货物的集中包装。
In some of usage environment, the engineering thermoplastics packaging case can cause stress concentration and cracking because of the bad design and processing technology.
热塑性工程塑料包装箱由于设计和加工工艺不当，在各种使用环境中易导致产品应力集中而开裂。
The influence of the different packaging types and micro-perforated parameters on the variety of gas concentration was theoretically analyzed.
理论分析了包装型式、微孔参数对包装内气份变化的影响。
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